| Solar energy, a kind of clean and renewable energy source, can be applied toelectricity generation. However, such factors as the utilization inefficiency of thesolar energy give rise to the low percentage of the solar energy-producedelectricity as opposed to the total electricity output. Thus, some kind of solartracker is in need to promote the utilization efficiency of the solar energy.Currently, solar trackers have been widely used in photovoltaic/thermal powersystems. However, although the current solar trackers meet the basic requirementof tracking the sun, they have showed some deficiencies in respect of trackingprecision as well as processing cost. On the basis of the movement rules of the sun,this dissertation proposes second tracking models by analysising the deficienciesof the current solar trackers: group tracking on polar axis and group tracking onpitch-south to north axis. Based on the models two practicable schemes of the solartracker are proposed and the relative spatial structure is designed.By comparing the two schemes of the solar tracker, the characteristics of thesedifferent schemes are respectively analysed: the group controlling is achieved bythe large reduction ratio of group tracker on polar axis. So the cost of the solartracker is decreased. The mechanical structure is simplified by adopting therotating holder in group tracker on pitch-south to north axis. Based on thecharacteristic of these schemes the group tracker on pitch-south to north axis issingled out for the experiment of the photovoltaic power. Based on this scheme,the specific structure of the tracker is designed. Furthermore, in consideration ofthe shading rate of the solar panels, a kind of improvement on the structure of thetracking device is finally made.Processing and assemblage of the solar tracker is carried out according to thedesigned drawings. Then this dissertation experiments with the tracker so as toconfirm the effect that the solar tracker takes in the photovoltaic power. Aprecision test of this solar tracker is carried out through experiment; in addition,the respective output power of the cell installed on the tracker and the fixed cell isobtained. After a comparative analysis, the output power of the cell installed on thetracker is far more than the fixed one. From that fact, the tracker designed by thisdissertation is very helpful to promote the efficiency of the photovoltaic power. |
